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Income taxes - Components of Income Taxes Attributable to Net Income for Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Federal      
Current $ 42,903 $ 61,534 $ 59,873
Deferred (6,099) 33,967 43,666
Deferred tax credits, net (12) (20) 268
Federal taxes 36,792 95,481 103,807
State      
Current 17,361 10,076 16,473
Deferred (3,269) 3,868 3,452
Deferred tax credits, net (87) (32) (37)
State taxes 14,005 13,912 19,888
Federal and state taxes 50,797 109,393 123,695
Hawaiian Electric Company, Inc. and Subsidiaries      
Federal      
Current 29,649 36,267 952
Deferred (5,245) 35,229 70,513
Deferred tax credits, net (12) (20) 268
Federal taxes 24,392 71,476 71,733
State      
Current 13,210 8,947 9,232
Deferred (2,737) 2,808 3,873
Deferred tax credits, net (87) (32) (37)
State taxes 10,386 11,723 13,068
Federal and state taxes $ 34,778 $ 83,199 $ 84,801